MEMS 2J good log files

Hi all,

Would anyone have log files from a 2J system that they would share?

I am a diagnostic specialist, specialising in German cars. I am doing someone a good turn, looking at a problem MGF.
I am testing the old fashioned way, with a multimeter and an osilloscope. I am not looking for assistance on the issue the car has,but it would help me a lot if I had some known good live data to ref for my testing.

Thanks.  

Anyway, I am curious, what is wrong with the car you are testing?

It is an emission issue, which a few garages have failed to sort out.

Just for others to know, which values you would like to get as refference of correct values?

I can't help you with log files, as I don't own a vehicle with a MEMS 2J, however the first thing I would be looking at is the lambda sensor (oxygen sensor) voltage.
It should be constantly changing, fluctuating between (from memory) 0.2V and 0.9V.
If there is a wiring fault or the sensor is open circuit then it will sit at the default voltage without changing.
The exact default voltage varies from one ECU to another, but one way if finding out what it is is to disconnect the lambda sensor and look in live data and see what sensor voltage you get with it disconnected.

Roverlike wrote:

Just for others to know, which values you would like to get as refference of correct values?

Good point, thanks.
I had hoped the tool you guys used processed quick enough that people would save lots of data pids.

I am interested in the important sensor inputs, the ones which take preference in the ECU processing, so -
MAP, in both pressure and signal voltage.
CTS, in both temp and signal voltage.
Intake temp, in both temp and signal voltage.
Engine speed, to ref the values I am looking at. 
Fuel trim, short term
Injector pulse width.

It would be great to see data at idle with a hot engine and at high idle, maybe 2500rpm.

Thanks

 

pscan.uk wrote:

I can't help you with log files, as I don't own a vehicle with a MEMS 2J, however the first thing I would be looking at is the lambda sensor (oxygen sensor) voltage.
It should be constantly changing, fluctuating between (from memory) 0.2V and 0.9V.
If there is a wiring fault or the sensor is open circuit then it will sit at the default voltage without changing.
The exact default voltage varies from one ECU to another, but one way if finding out what it is is to disconnect the lambda sensor and look in live data and see what sensor voltage you get with it disconnected.

Thanks. First thing I looked at. The sensor that was in it was a cheap copy and was not functioning properly. I check these on a scope, the best way to do it. I recall from when I tested MEMS yaars ago, these didn't like anything but Bosch O2 sensors. So I fitted a Bosch one, which works, but it shows me there is another issue.

What I am doing, for example, I know the CTS sensor was changed. So I am looking for known data for what temp matches what signal voltage to enable me see if this car has just been made worse with cheap aftermarket parts being fitted in the few guessanostic sessions it had endured. 
 

Here's what I measured on a new OEM sensor by putting it in hot water and measuring with an ohm meter

16C   2600ohms
38C   1700ohms
57C   970ohms
66C   630ohms
77C   460ohms
79C   350ohms
88C   320ohms